Thiosemicarbazone Derivatives as Inhibitors of Amyloid-β Aggregation: Effect of Metal Coordination
作者:Ana I. Matesanz、Ana B. Caballero、Carmen Lorenzo、Alba Espargaró、Raimon Sabaté、Adoración G. Quiroga、Patrick Gamez
DOI:10.1021/acs.inorgchem.0c00467
日期:2020.5.18
Three thiosemicarbazone derivatives, namely 4-(dimethylamino)benzaldehyde 4,4-dimethylthiosemicarbazone (HL1), 4-(dimethylamino)benzaldehyde thiosemicarbazone (HL2), and 4-(dimethylamino)benzaldehyde 4-methylthiosemicarbazone (HL3), have been synthesized and characterized. The three palladium(II) complexes 1-3 were prepared respectively from HL1, HL2, and HL3. The crystal structures of two coordination
合成并表征了3种硫代半脲衍生物,即4-(二甲氨基)苯甲醛4,4-二甲基硫代半脲(HL1),4-(二甲氨基)苯甲醛硫代半缩酮(HL2)和4-(二甲氨基)苯甲醛4-甲基硫代半脲(HL3),并对其进行了表征。分别从HL1,HL2和HL3制备了三种钯(II)配合物1-3。获得了两种配位化合物,即Pd(L2)2(2)和Pd(L3)2(3)的晶体结构,显示了金属中心预期的方平面环境。配体HL3和Pd(II)配合物1-3在含5%DMSO的缓冲溶液中稳定,对淀粉样β的聚集表现出显着的抑制性能,从而减少了原纤维的形成。HL1,HL3、2和3显示IC50值(即,将Aβ纤颤降低50%所需的浓度低于1μM,则降低了参考化合物儿茶素的浓度(IC50 = 2.8μM)。最后,在用大肠杆菌进行的纤维素研究中,钯(II)化合物在抑制细菌包涵体内的Aβ聚集方面比游离配体有效得多,从而说明了金属配位的有益作用。